Quote from: blackgold on July 09, 2011, 10:42:31 PM

Unit is correct. When reading a power supplies rated efficiency such as 80, 85.. whatever is not shown i.e 100-80=20% is what is lost in the conversion from wall power to make the power... So if your power supply can deliver 1000w @ 80%, then the power from the wall must be 20% greater to make up for loss.

Wouldn't the draw at the wall be 25% greater? If a PSU draws 1250W from the wall and is 80% efficient then it is supplying 1250W * 80% = 1000W to the miner.

Honestly I don't know what the efficiency rating on the PSU means but if by 80% they mean that only 80% of the power it receives is passed on then the draw at wall would have to be 1250W.